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Finding the Fourth Proportional to 68,390.40, 102,585.60 and 45,043.20

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Solution

The fourth proportional to 68,390.40, 102,585.60 and 45,043.20 is: 67,564.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    68,390.40 : 102,585.60 = 45,043.20 : x
  2. Step 2: Convert to fraction form
    68,390.40/102,585.60 = 45,043.20/x
  3. Step 3: Cross multiply
    68,390.40x = 102,585.60 × 45,043.20
  4. Step 4: Simplify right side
    68,390.40x = 4,620,783,697.92
  5. Step 5: Solve for x
    x = 4,620,783,697.92/68,390.40
  6. Step 6: Final answer
    x = 67,564.80

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.